Top up account:
You are able to top up your account at any stage. This will allow you to make payment towards your account balance as needed or desired.
Monthly billing:
All (pending) shipping charges will be invoiced and all credit notes will be raised (if applicable) on the last day of the month, just before midnight. Payment is then auto-charged on the first of the next month for the account balance amount, including the the previous month’s subscription fee, plus all shipping charges incurred during that month.
However, should you reach 80% of your limit before you are invoiced, you will have to settle your account before you are able to make any more shipments. If you add your credit card details, the system will automatically charge your card with the relevant amount.